What is the importance of keys in a database?

What is the importance of keys in a database?

Keys are crucial in databases as they uniquely identify records, ensuring data integrity and enabling efficient data retrieval.

Can you explain the different types of keys?

Sure! The main types of keys include primary keys, foreign keys, and composite keys, each serving specific roles in data relationships.

How do primary keys differ from foreign keys?

Primary keys uniquely identify a record in a table, while foreign keys link records between tables, establishing relationships.

What happens if a primary key is not defined?

Without a primary key, a table may have duplicate records, leading to data inconsistency and difficulties in data management.

Can you give an example of a composite key?

Certainly! A composite key is made up of two or more columns. For example, in a student enrollment table, a combination of student ID and course ID can serve as a composite key.